| 摘要 |
<p>The invention relates to general-purpose electronic circuits and can be used in high-fidelity sound recording and reproduction systems. The electric circuit of the magnetic tape recorder comprises: a device for magnetically recording analog signals situated in the area of movement of the magnetic tape, and a device for converting non-electrical signals into electrical signals. The recording device comprises the following elements in series: a recording amplifier, a balancing filter, a rectifier, addition amplifier and high-frequency magnetisation current modulator, magnetic recording head, rejector unit and high-frequency magnetising current generator whose output is connected to the corresponding input of the high-frequency magnetisation current modulator whose output together with that of the recording amplifier is connected to the input of the magnetic recording head. The device for converting non-electrical signals into electrical signals comprises the magnetic reproduction head, a correcting circuit connected in parallel to it, an operating amplifier between the output of which and the common conductor is connected a feedback circuit; the first output of the magnetic reproduction head is connected to the inverting input of the operating amplifier and the second output is connected to the output of the negative feedback circuit, the non-inverting input of the operating amplifier is connected to the common conductor whilst the output is connected to the input of the sound reproduction system which may consist of a power amplifier to whose output is connected the coil of the dynamic loudspeaker and which has an output resistance at least 1.26 times greater than that of the coil.</p> |
